Pauly, I offered my comments only in general terms about uni's and low compliance cartridges that I have tried. The effective mass of the arm is going to work to your advantage with the stiffer cantilever. If you have the mass to load the cantilever abit then I would suspect all would be well. If there is not quite enough loading on the cantilever due to the mass of the arm and cartridge then the uni can tend to wobble.
I have run a 103r on a Graham 2.2. For the most part the 2.2 does great with this cart, but dynamic passages tend to loose focus a bit. This does not happen when I mount the 103r on my Basis Vector, a modified uni. Mind you these differences I hear are suttle and the 103r has a mass of around 8 grams.